boardid.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <boardid.h>
#include <gpio.h>
#include <console/console.h>
 
/*
 * Gale boards dedicate to the board ID three GPIOs in ternary mode: 64, 65
 * and 66.
 */
 
static int board_id_value = -1;
 
static uint8_t get_board_id(void)
{
        uint8_t bid;
        gpio_t hw_rev_gpios[] = {[2] = 66, [1] = 65, [0] = 64}; /* 64 is LSB */
 
        bid = gpio_binary_first_base3_value(hw_rev_gpios,
                ARRAY_SIZE(hw_rev_gpios));
        printk(BIOS_INFO, "Board ID %d\n", bid);
 
        return bid;
}
 
uint32_t board_id(void)
{
        if (board_id_value < 0)
                board_id_value = get_board_id();
 
        return board_id_value;
}